Which of the following animal excrete nitrogenous waste mainly as uric acid?
Correct answer: D. Birds.
- A. Hydra
- B. Planaria.
- C. Humans
- D. Birds.
Explanation
Birds excrete nitrogen mainly as uric acid, which requires little water and forms a semi-solid paste, an adaptation useful for flight and reproduction within the egg. Humans excrete urea, while hydra and planaria mainly release ammonia; students may choose humans because urea is the best-known nitrogenous waste.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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